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9#include <linux/kernel.h>
10#include <linux/errno.h>
11#include <linux/slab.h>
12#include <linux/module.h>
13#include <linux/string.h>
14#include <linux/usb.h>
15
16
17#define DRIVER_AUTHOR "Harrison Metzger <harrisonmetz@gmail.com>"
18#define DRIVER_DESC "USB 7 Segment Driver"
19
20#define VENDOR_ID 0x0fc5
21#define PRODUCT_ID 0x1227
22#define MAXLEN 8
23
24
25static const struct usb_device_id id_table[] = {
26 { USB_DEVICE(VENDOR_ID, PRODUCT_ID) },
27 { },
28};
29MODULE_DEVICE_TABLE(usb, id_table);
30
31
32static const char *display_textmodes[] = {"raw", "hex", "ascii"};
33
34struct usb_sevsegdev {
35 struct usb_device *udev;
36 struct usb_interface *intf;
37
38 u8 powered;
39 u8 mode_msb;
40 u8 mode_lsb;
41 u8 decimals[MAXLEN];
42 u8 textmode;
43 u8 text[MAXLEN];
44 u16 textlength;
45
46 u8 shadow_power;
47 u8 has_interface_pm;
48};
49
50
51
52
53
54
55static inline size_t my_memlen(const char *buf, size_t count)
56{
57 if (count > 0 && buf[count-1] == '\n')
58 return count - 1;
59 else
60 return count;
61}
62
63static void update_display_powered(struct usb_sevsegdev *mydev)
64{
65 int rc;
66
67 if (mydev->powered && !mydev->has_interface_pm) {
68 rc = usb_autopm_get_interface(mydev->intf);
69 if (rc < 0)
70 return;
71 mydev->has_interface_pm = 1;
72 }
73
74 if (mydev->shadow_power != 1)
75 return;
76
77 rc = usb_control_msg(mydev->udev,
78 usb_sndctrlpipe(mydev->udev, 0),
79 0x12,
80 0x48,
81 (80 * 0x100) + 10,
82 (0x00 * 0x100) + (mydev->powered ? 1 : 0),
83 NULL,
84 0,
85 2000);
86 if (rc < 0)
87 dev_dbg(&mydev->udev->dev, "power retval = %d\n", rc);
88
89 if (!mydev->powered && mydev->has_interface_pm) {
90 usb_autopm_put_interface(mydev->intf);
91 mydev->has_interface_pm = 0;
92 }
93}
94
95static void update_display_mode(struct usb_sevsegdev *mydev)
96{
97 int rc;
98
99 if(mydev->shadow_power != 1)
100 return;
101
102 rc = usb_control_msg(mydev->udev,
103 usb_sndctrlpipe(mydev->udev, 0),
104 0x12,
105 0x48,
106 (82 * 0x100) + 10,
107 (mydev->mode_msb * 0x100) + mydev->mode_lsb,
108 NULL,
109 0,
110 2000);
111
112 if (rc < 0)
113 dev_dbg(&mydev->udev->dev, "mode retval = %d\n", rc);
114}
115
116static void update_display_visual(struct usb_sevsegdev *mydev, gfp_t mf)
117{
118 int rc;
119 int i;
120 unsigned char *buffer;
121 u8 decimals = 0;
122
123 if(mydev->shadow_power != 1)
124 return;
125
126 buffer = kzalloc(MAXLEN, mf);
127 if (!buffer)
128 return;
129
130
131 for (i = 0; i < mydev->textlength; i++)
132 buffer[i] = mydev->text[mydev->textlength-1-i];
133
134 rc = usb_control_msg(mydev->udev,
135 usb_sndctrlpipe(mydev->udev, 0),
136 0x12,
137 0x48,
138 (85 * 0x100) + 10,
139 (0 * 0x100) + mydev->textmode,
140 buffer,
141 mydev->textlength,
142 2000);
143
144 if (rc < 0)
145 dev_dbg(&mydev->udev->dev, "write retval = %d\n", rc);
146
147 kfree(buffer);
148
149
150 for (i = 0; i < sizeof(mydev->decimals); i++)
151 decimals |= mydev->decimals[i] << i;
152
153 rc = usb_control_msg(mydev->udev,
154 usb_sndctrlpipe(mydev->udev, 0),
155 0x12,
156 0x48,
157 (86 * 0x100) + 10,
158 (0 * 0x100) + decimals,
159 NULL,
160 0,
161 2000);
162
163 if (rc < 0)
164 dev_dbg(&mydev->udev->dev, "decimal retval = %d\n", rc);
165}
166
167#define MYDEV_ATTR_SIMPLE_UNSIGNED(name, update_fcn) \
168static ssize_t name##_show(struct device *dev, \
169 struct device_attribute *attr, char *buf) \
170{ \
171 struct usb_interface *intf = to_usb_interface(dev); \
172 struct usb_sevsegdev *mydev = usb_get_intfdata(intf); \
173 \
174 return sprintf(buf, "%u\n", mydev->name); \
175} \
176 \
177static ssize_t name##_store(struct device *dev, \
178 struct device_attribute *attr, const char *buf, size_t count) \
179{ \
180 struct usb_interface *intf = to_usb_interface(dev); \
181 struct usb_sevsegdev *mydev = usb_get_intfdata(intf); \
182 \
183 mydev->name = simple_strtoul(buf, NULL, 10); \
184 update_fcn(mydev); \
185 \
186 return count; \
187} \
188static DEVICE_ATTR_RW(name);
189
190static ssize_t text_show(struct device *dev,
191 struct device_attribute *attr, char *buf)
192{
193 struct usb_interface *intf = to_usb_interface(dev);
194 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
195
196 return snprintf(buf, mydev->textlength, "%s\n", mydev->text);
197}
198
199static ssize_t text_store(struct device *dev,
200 struct device_attribute *attr, const char *buf, size_t count)
201{
202 struct usb_interface *intf = to_usb_interface(dev);
203 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
204 size_t end = my_memlen(buf, count);
205
206 if (end > sizeof(mydev->text))
207 return -EINVAL;
208
209 memset(mydev->text, 0, sizeof(mydev->text));
210 mydev->textlength = end;
211
212 if (end > 0)
213 memcpy(mydev->text, buf, end);
214
215 update_display_visual(mydev, GFP_KERNEL);
216 return count;
217}
218
219static DEVICE_ATTR_RW(text);
220
221static ssize_t decimals_show(struct device *dev,
222 struct device_attribute *attr, char *buf)
223{
224 struct usb_interface *intf = to_usb_interface(dev);
225 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
226 int i;
227 int pos;
228
229 for (i = 0; i < sizeof(mydev->decimals); i++) {
230 pos = sizeof(mydev->decimals) - 1 - i;
231 if (mydev->decimals[i] == 0)
232 buf[pos] = '0';
233 else if (mydev->decimals[i] == 1)
234 buf[pos] = '1';
235 else
236 buf[pos] = 'x';
237 }
238
239 buf[sizeof(mydev->decimals)] = '\n';
240 return sizeof(mydev->decimals) + 1;
241}
242
243static ssize_t decimals_store(struct device *dev,
244 struct device_attribute *attr, const char *buf, size_t count)
245{
246 struct usb_interface *intf = to_usb_interface(dev);
247 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
248 size_t end = my_memlen(buf, count);
249 int i;
250
251 if (end > sizeof(mydev->decimals))
252 return -EINVAL;
253
254 for (i = 0; i < end; i++)
255 if (buf[i] != '0' && buf[i] != '1')
256 return -EINVAL;
257
258 memset(mydev->decimals, 0, sizeof(mydev->decimals));
259 for (i = 0; i < end; i++)
260 if (buf[i] == '1')
261 mydev->decimals[end-1-i] = 1;
262
263 update_display_visual(mydev, GFP_KERNEL);
264
265 return count;
266}
267
268static DEVICE_ATTR_RW(decimals);
269
270static ssize_t textmode_show(struct device *dev,
271 struct device_attribute *attr, char *buf)
272{
273 struct usb_interface *intf = to_usb_interface(dev);
274 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
275 int i;
276
277 buf[0] = 0;
278
279 for (i = 0; i < ARRAY_SIZE(display_textmodes); i++) {
280 if (mydev->textmode == i) {
281 strcat(buf, " [");
282 strcat(buf, display_textmodes[i]);
283 strcat(buf, "] ");
284 } else {
285 strcat(buf, " ");
286 strcat(buf, display_textmodes[i]);
287 strcat(buf, " ");
288 }
289 }
290 strcat(buf, "\n");
291
292
293 return strlen(buf);
294}
295
296static ssize_t textmode_store(struct device *dev,
297 struct device_attribute *attr, const char *buf, size_t count)
298{
299 struct usb_interface *intf = to_usb_interface(dev);
300 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
301 int i;
302
303 i = sysfs_match_string(display_textmodes, buf);
304 if (i < 0)
305 return i;
306
307 mydev->textmode = i;
308 update_display_visual(mydev, GFP_KERNEL);
309 return count;
310}
311
312static DEVICE_ATTR_RW(textmode);
313
314
315MYDEV_ATTR_SIMPLE_UNSIGNED(powered, update_display_powered);
316MYDEV_ATTR_SIMPLE_UNSIGNED(mode_msb, update_display_mode);
317MYDEV_ATTR_SIMPLE_UNSIGNED(mode_lsb, update_display_mode);
318
319static struct attribute *dev_attrs[] = {
320 &dev_attr_powered.attr,
321 &dev_attr_text.attr,
322 &dev_attr_textmode.attr,
323 &dev_attr_decimals.attr,
324 &dev_attr_mode_msb.attr,
325 &dev_attr_mode_lsb.attr,
326 NULL
327};
328
329static const struct attribute_group dev_attr_grp = {
330 .attrs = dev_attrs,
331};
332
333static int sevseg_probe(struct usb_interface *interface,
334 const struct usb_device_id *id)
335{
336 struct usb_device *udev = interface_to_usbdev(interface);
337 struct usb_sevsegdev *mydev = NULL;
338 int rc = -ENOMEM;
339
340 mydev = kzalloc(sizeof(struct usb_sevsegdev), GFP_KERNEL);
341 if (!mydev)
342 goto error_mem;
343
344 mydev->udev = usb_get_dev(udev);
345 mydev->intf = interface;
346 usb_set_intfdata(interface, mydev);
347
348
349 mydev->shadow_power = 1;
350 mydev->has_interface_pm = 0;
351
352
353 mydev->textmode = 0x02;
354 mydev->mode_msb = 0x06;
355 mydev->mode_lsb = 0x3f;
356
357 rc = sysfs_create_group(&interface->dev.kobj, &dev_attr_grp);
358 if (rc)
359 goto error;
360
361 dev_info(&interface->dev, "USB 7 Segment device now attached\n");
362 return 0;
363
364error:
365 usb_set_intfdata(interface, NULL);
366 usb_put_dev(mydev->udev);
367 kfree(mydev);
368error_mem:
369 return rc;
370}
371
372static void sevseg_disconnect(struct usb_interface *interface)
373{
374 struct usb_sevsegdev *mydev;
375
376 mydev = usb_get_intfdata(interface);
377 sysfs_remove_group(&interface->dev.kobj, &dev_attr_grp);
378 usb_set_intfdata(interface, NULL);
379 usb_put_dev(mydev->udev);
380 kfree(mydev);
381 dev_info(&interface->dev, "USB 7 Segment now disconnected\n");
382}
383
384static int sevseg_suspend(struct usb_interface *intf, pm_message_t message)
385{
386 struct usb_sevsegdev *mydev;
387
388 mydev = usb_get_intfdata(intf);
389 mydev->shadow_power = 0;
390
391 return 0;
392}
393
394static int sevseg_resume(struct usb_interface *intf)
395{
396 struct usb_sevsegdev *mydev;
397
398 mydev = usb_get_intfdata(intf);
399 mydev->shadow_power = 1;
400 update_display_mode(mydev);
401 update_display_visual(mydev, GFP_NOIO);
402
403 return 0;
404}
405
406static int sevseg_reset_resume(struct usb_interface *intf)
407{
408 struct usb_sevsegdev *mydev;
409
410 mydev = usb_get_intfdata(intf);
411 mydev->shadow_power = 1;
412 update_display_mode(mydev);
413 update_display_visual(mydev, GFP_NOIO);
414
415 return 0;
416}
417
418static struct usb_driver sevseg_driver = {
419 .name = "usbsevseg",
420 .probe = sevseg_probe,
421 .disconnect = sevseg_disconnect,
422 .suspend = sevseg_suspend,
423 .resume = sevseg_resume,
424 .reset_resume = sevseg_reset_resume,
425 .id_table = id_table,
426 .supports_autosuspend = 1,
427};
428
429module_usb_driver(sevseg_driver);
430
431MODULE_AUTHOR(DRIVER_AUTHOR);
432MODULE_DESCRIPTION(DRIVER_DESC);
433MODULE_LICENSE("GPL");
434
